Fuel injection system



April ,1952 G. B. wooD, JR 2,592,367

FUEL INJECTION SYSTEM Filed NOV. 13, 1946 INVENTOR. Glzolzer. B.WOOD,JE.

ATTOENEX ?etented Apr. 8, 1952 TENT OFFICE FUEDQINJECTION SYSTEM GergeBhWood, Jr., SpringfieIgl Mass assignor o. Amri an..-.B9s@ rpor ion,springfieldl, M ss a comp etio of Y k Application Nove'mber 13, 1946,Serial No. 709,603 6;.Claims, (Cl. 103%1) This invention-relates to fuelinjection systems and more particularly to such systems whereinaplurality offuel injection pumps are employed whereby the mechanicalload -.on the engine is balanced;

An object of the inventionisto-provide a'fuel injectionsystemhaving-a-master pump and one or more slave pumps wherein-thequantity'of fuel delivered'and-the timingof all of the pumps iscontrolled by the controls for the master-pump.

Another object of the invention is to provide a fuel injectionsystemofthe type setforth'wherein -a plurality of pumps areemployed withall of the controls on one of. thepumps whereby merely a singleadjustment of the controls-is necessary for adjusting all ofthepumps-and-yet a doublepump' construction is provided-for balancing thedrive forces or mechanical loads on the engine. a c

Other objects and advantages of the invention will be apparent from thefollowing description taken in connection with the accompanying drawing.It will be understood that many changes may be made in the details ofconstruction and arrangement of parts without depart-- ing from thespirit of the invention as expressed in the accompanying claims.- I,therefore, do not wish to be limited to the exact details ofconstruction. and arrangement of parts shown and described, as thepreferred form has been shown by .way of illustration only- Referring tothe drawing;

In the drawing there is shown a diagrammatic view, partly in section,showing one form; of fuel injection system embodying the invention.

Referring more particularly to the drawing, the fuel injection systemshown. comprises a. master pump l, a slave pump 2 and a nozzle 3.

The nozzle 3 may be of any suitable conventional nozzle or accumulatornozzle type.

The fuel delivery lines A, 5 and B are provided between the pumps andconnecting the pumps to the nozzle 3.

The pumps I and 2 are adapted to receive fuel from the usual type fuelsupply tank through the fuel line i which has branches 8 and 9connecting said line to the pumps 1 and 2 respectively, and fuel isadapted to pass through said line and branches as shown by the arrows inthe draw- The slave pump 2 comprises the housing It having the annularfuel sump H which is connected to the branch 9 of the fuel supply line7, and the barrel 12 in which is reciprocably mounted the plunger [8aand which barrel is provided with the ports l3 connecting the fuelisumpit with the bore. l4.:.of the barrel l2;whioh -forms the pumpingchamberof the pumphandi which is. connected. with the fuel delivery linel.

The master .pumpl comprises the housingjgi having the-fuel sump 16connected to the branch 8 of the fuelsupplyline'l and contains the barrel ll. in which is mounted the plunger. I 8;Wh'lph plunger is adaptedto reciprocatein the bore [9 inthe barrel ll. The barrel. H is providedvwith the annula sp roov .29. whic v .connecte by the port 2! to the fuelsump it and the spill ports 22 which-connect the bore IQAvithsaidsumnlfi T e. lun e 181 i;hams r-rump; l s of d ubl hel xi pa t t is, iti I pro ded .w'th h i e fiz onii o osite ide sm n 011W. ch how an a d une s. also pre iec with; -the bore 23 co: municating with the bor eI-SJof-the barrel ll 'at its upper end and which b recw ec edb t e re 24xtend ns throu h ihe e lu ed t ntfi of t l n er a its l r. nd :b lo the1 edge 3 .1 the plun er-1. ,8;-i-

he..f e drain l ne lit-is pr ded with-th branches 2? and -25 and is.adapted to drain off any eak e The baigreLl'l is provided-with a; gearsegment in; engagement with; the control .rack- 2 9 whereby said bae.1.;. ga e-adivs e dirsini o aid. on l a rd us t e. qua t t o fueldelivered by both pumps andthe geartt operates rack teeth on the-barrelfor-adj-us ng the barrel vertically for timing the delivery ofbothpumps. From this it will be seen'that the qpan t oi vfuel d l v ed be-b th bu ings-con.- tr 11ed-bvro i ns th rel q h masier urnp l by meansof thecontrolrack-Zfi .whichpper tes a gear segment ontheibarreliand-the reciprocating or vertical adjustmentof the barrel bymeans of the gear 30 operating the rack teeth on the barrel adjusts thedelivery timing for both pumps.

At the upper end of the pump I is provided the delivery valve member 3!which is in the form of an annular flexible spring disc member which issecured to the member 32 which extends into the upper end of the bore l9and which has an opening therethrough adapted to be aligned with thefuel delivery line branch 5.

In the operation of the pumps as the plungers move upward on theirpumping stroke, the plunger I8a in the pump 2 closes oif the fill portl3 at about the same time the plunger l8 closes off the annular spillgroove 29. The plungers continue to move in the bores l4 and I9respectively and fuel is pumped through the lines 4 and 5 through thebore or hole 23 and port 24 in plunger 18 and out through the meteringspill ports 22 until the helix on the plunger [8 closes off the meteringports 22 and as the plungers continue to move in, fuel is delivered tothe nozzle through the fuel delivery lines 4, 5 and 6 until the spilledge 33 of the plunger l8 passes the bottom edge of spill groove 20which then spills in the usual manner.

It will be noted that the start of pumping and the end of pumping ofboth pumps are controlled by the metering events of the master pump.

While only a single slave pump has been shown in conjunction with themaster pump, it will be obvious that additional slave pumps could beemployed if desired.

From the foregoing it will be seen that I have provided simple,efiicient and economical means for obtaining all of the objects andadvantages of the invention.

Having described my invention, I claim:

1. In a fuel injection system, a pair of fuel injection pumps, one ofsaid pumps being a master pump and the other of said pumps being a slavepump and controlled through control of said master pump, a fuel deliveryline common to both of said pumps, said pumps each including a bore anda plunger adapted to be reciprocated in said bore, the plunger of saidmaster pump having a spill port communicating with said common deliveryline whereby said spill port will bypass fuel pumped by both pumps.

2. In a fuel injection system, a pair of fuel injection pumps adapted tobe mounted to balance the mechanical load on the engine, one of saidpumps being a master pump, the other of said pumps being a slave pumpand controlled through control of said master pump, a fuel delivery linecommon to said pumps, a fuel supply line common to said pumps, saidpumps each including a bore and a plunger adapted to be reciprocated insaid bore, said master pump having a spill port communicating with saidcommon delivery line whereby said spill port will bypass fuel pumped byboth pumps.

3. In a fuel injection system, a pair of fuel injection pumps, one ofsaid pumps being a master pump and the other of said pumps being a slavepump and controlled through control of said master pump, a fuel deliveryline common to both of said pumps, said pumps each including a bore anda plunger adapted to be reciprocated in said bore, the plunger of saidmaster pump having a spill port therein and extending below the spilledge of said plunger, said port communicating with said common deliveryline whereby said spill port will bypass fuel pumped by both pumps.

4. In a fuel injection system, a pair of fuel injection pumps, one ofsaid pumps being a master pump and the other of said pumps being a slavepump and controlled through control of said master pump, a. fueldelivery line common to both of said pumps, said pumps each including abore and a plunger adapted to be reciprocated in said bore, the plungerof said master pump having a spill port communicating with said commondelivery line whereby said spill port will bypass fuel pumped by bothpumps and means for controlling the quantity of fuel bypassed throughsaid spill port.

5. In a fuel injection system, a pair of fuel injection pumps adapted tobe mounted to balance the mechanical load on the engine, one of saidpumps being a master pump, the other of said pumps being a slave pumpand controlled through control of said master pump, a fuel delivery linecommon to said pumps, a fuel supply line common to said pumps, saidpumps each including a bore and a plunger adapted to be reciprocated insaid bore, said master pump having a spill port communicating with saidcommon delivery line whereby said spill port will bypass fuel pumped byboth pumps and means for controlling the quantity of fuel bypassedthrough said spill port.

6. In a fuel injection system, a pair of fuel injection pumps, one ofsaid pumps being a master pump and the other of said pumps being a slavepump and controlled through control of said master pump, a fuel deliveryline common to both of said pumps, said pumps each including a bore anda plunger adapted to be reciprocated in said bore, the plunger of saidmaster pump having a spill port therein and extending below the spilledge of said plunger, said port communicating with said common deliveryline whereby said spill port will bypass fuel pumped by both pumps andmeans for controlling the quantity of fuel bypassed through said spillport.

GEORGE B. WOOD, JR.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name 1 Date 1,628,657 Dorner May 17, 1921,976,151 Thaheld Oct. 9, 1934 2,265,997 Bremser Dec- 16, 1941 2,282,562Cole May 12, 1942 2,296,357 Links et al. Sept. 22, 1942 2,297,511 VoltSept. 29, 1942 2,360,526 Staples Oct. 17, 1944

